How to make buttons active and non-active

Hi,
I don't know what words to use. But on a panel using cardlayout i have added many cards and. On the first card i have a text field and a password field
i have already stored those username and password and when i press the ok button i enters the next card, till here its fine and works good.
Now the actual problem:
I have even added few buttons like next and previous which can be seen on every card using BorderLayout. If i press the next button instead of entering the details and pressing ok the next card is displayed. So i want to deactivate these buttons just on first card how to do that.Please some body help.

On things like buttons you can use the setEnabled method. It takes a boolean, true or false. I think they are enabled by default.